What causes "backend not ready"?

readiness failing selector mismatch pods not running

Is the "backend not ready" error serious?

Yes. This is a high-severity error that usually blocks work until it is fixed, but the steps above resolve it.

KubernetesINTERMEDIATEHIGHLast verified Dec 6, 2025· 10 views

Error when Ingress controller cannot reach backend

Fixes backend not ready

kubernetes — error

$# backend not ready
backend not ready

No healthy endpoints found for backend service

1Check endpoints

kubectl get endpoints

2Check readiness

kubectl get pods READY column

3Match selectors

Service selector vs pod labels

4Check probe

kubectl describe pod

Fix probe

Readiness controls endpoints. Liveness restarts containers.

What does "backend not ready" mean?: No healthy endpoints found for backend service
How do I fix "backend not ready"?: Error when Ingress controller cannot reach backend
What causes "backend not ready"?: readiness failing selector mismatch pods not running
Is the "backend not ready" error serious?: Yes. This is a high-severity error that usually blocks work until it is fixed, but the steps above resolve it.